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Variable Interest Entities (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) generator | Sep. 30, 2018 USD ($) MW | Sep. 30, 2017 USD ($) generator | Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year | $ 3,101 |  | $ 3,101 |  | $ 3,078 | [1]
Long term debt | 32,188 |  | 32,188 |  | 30,948 | [1]
Virginia Electric and Power Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year | 350 |  | 350 |  | 850 | [2]
Long term debt | 10,742 |  | 10,742 |  | 10,496 | [2]
Affiliated current borrowings | 15 |  | 15 |  | 33 | [2]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Long term debt | 4,061 |  | 4,061 |  | 3,570 | [3]
Affiliated current borrowings | 24 |  | 24 |  | 18 | [3]
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year | 27 |  | 27 |  |  |
Long term debt | 326 |  | $ 326 |  |  |
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Long term capacity contract non utility generators (generators) | generator |  |  |  | 3 |  |
Number of expired non-utility generators | generator |  | 2 |  | 2 |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  |  | 218 |  |  |
Remaining purchase commitments | 163 |  | $ 163 |  |  |
Payment for electric capacity | 13 | $ 17 | 38 | $ 73 |  |
Other energy-related purchases | 4 | 5 | 14 | 20 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Shared services purchased | 79 | 83 | 251 | 251 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Payables to Affiliates |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Affiliated current borrowings | 23 |  | 23 |  | 36 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Shared services purchased | 31 | $ 31 | 94 | $ 93 |  |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES | Payables to Affiliates |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Affiliated current borrowings | $ 11 |  | $ 11 |  | $ 14 |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

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